Abstract: A large-sized and heavy part (1) of plastic material is injection molded. Localized zones are created in which the thermal conductance of the part (1) is higher in the surface impressions (10) at the mold ejectors for the removal of the part after it has been molded. In a preferred embodiment, the outer surface of the part (1) has, at the surface impressions (10), clusters of closed-bottom pits (13) formed by grids of mini-ribs (11) and (12) arranged perpendicularly with respect to each other. The thickness of the part varies from a maximum value (S1) at the periphery of the cavity to a minimum value (S2) at the bottom of a substantial number of the pits (13).

Abstract: Dishwashing machine including a washing tank (1) provided with an upper aperture (6) and a lower aperture (7) that are interconnected through a conduit (8) extending outside the tank. During drying, the vapor in the tank is caused to circulate along a closed-loop flow-path defined by the tank and the conduit (8), thereby reducing to a minimum the effect of thermal stratification of the vapor in the tank and, as a result, favoring a homogeneous drying effect of the washload items.

Abstract: A clothes washing machine is provided with an oscillating washing assembly including a rotating drum capable of being driven at various rotating speeds and provided with a plurality of annular hollow bodies secured to the drum. A plurality of moving masses are capable of freely moving within the hollow bodies. Before at least one spin-extraction phase, the drum is driven to rotate in a continuous manner at a variable, relatively low speed which is lower than the resonance frequency of the oscillating washing assembly, but is adequate to cause the washload in the drum to keep adhering against the inner peripheral surface of the drum. As soon as the moving masses succeed in distributing themselves in such a manner that their center of gravity locates itself in a position that is substantially opposite to the unbalance condition of the washload, the drum is started to rotate at the desired spin-extraction rate.

Abstract: A clothes washing machine, or a similar appliance such as a washer/dryer, includes a flexible duct, such as a bellows, arranged between the opening (5) of a door (4), intended for loading and unloading the clothes, and an associated opening (8) provided on an inner washing tub (10). Peripheral folds (16), the outer end (13) and a cylindrical band (15) of the bellows (12), are made with a material having elastomeric properties and a hardness of about Shore A 20 to 30. The inner end (15) of the bellows is made with a synthetic material having a hardness of about Shore A 40 to 50. The machine is low noise. A greater unbalanced load of clothes can be tolerated since the improved bellows minimize the vibrations, generated by the inner washing tub when the machine is operated, which are transmitted to the outer cabinet of the machine.

Abstract: A monitoring arrangement for the filter of a washing machine is disclosed wherein the user is warned of the clogged filter when an actual clogging condition occurs. Control elements that are normally used in washing machines, such as an analog pressure switch (13) and an electronic control circuit (14), are utilized. The control parameter for detecting clogging is the variation of the water pressure before and after the priming of the drain pump (12) or the recirculator pump (17) of the machine.

Abstract: A dishwashing machine having a reservoir (6) communicating with the washing tank (1) through a lower aperture (7) connected to the delivery side of a drain pump (3). The reservoir (6) comprises an upper aperture (9) capable of communicating with the outside ambient through a valve (10) which is controlled by the program sequence control switch (13) of the machine so as to open during a pre-determined water discharge phase to enable the reservoir (6) to be filled by the water being let out from the tank (1); to temporarily close so as to prevent said reservoir (6) from emptying after said water discharge phase; and to finally open again so as to enable the water stored in the reservoir (6) to flow back into the washing tank (1), through the lower aperture (7) and the pump (3), to be used during said subsequent phase of the washing process.

Abstract: A dishwashing machine includes a water circulating circuit with rotating spray arms 6, 7 arranged in a washing tub 3 and supplied with water by a pump provided to recirculate water collecting in a sump 5. The water is heated by a resistance-type electric heating element 11 arranged in a casing 10. Through the surface of the casing, the heating element is in a heat exchange relationship with both the interior of the washing tub and the water collecting in said sump. The casing 10 is provided in the water circulation circuit of the dishwashing machine in a parallel arrangement with respect to the spray arms 6, 7, with an inlet 12 connected to the delivery side 14 of the pump 8, and with an outlet 13 communicating with the interior of the washing tub 3.

Abstract: A method for controlling the amount of water filled in a dishwashing machine through a normally closed valve (18) to carry out a duty cycle of the machine in which the water is sprayed onto the washload items by a circulation pump (10) driven by an electric motor (11). The water is put under pressure by the pump in an intermittent manner with an alternate sequence of pre-set operating periods (T) and pauses (S) during which the motor rotating speed is at its highest value (V.sub.1) and lowest value (V.sub.0), respectively. The valve (18) is opened in at least one subsequent pause (S) following a preceding period (T) in which the pressure of the water in correspondence of the pump (10) decreases below a pre-determined threshold value (P.sub.2).

Abstract: An arrangement for mounting the motor in a clothes washing machine for the purpose of reducing the noise produced by the machine during operation thereof. The electric motor (10) is fixed to the tub of the machine on brackets (12) provided with seats (13) for accommodating the shaft (16). Shock absorbing means (14-15) are provided within the seats (13), as well as an elastic element (17) for connecting the motor (10) to at least one of the brackets (12).

Abstract: A clothes washing machine is provided with a wash tub and a perforated drum arranged therein. A recirculating pump pumps liquid contained in a conduit provided with a pressure switch in its lower portion, arranged under the tub, and directed again toward the interior of the drum. The machine is capable, at least in a rinse cycle, of filling a predetermined amount of water into the tub, to let the recirculating pump operate for a definite period of time so as to enable the water to be fully pumped into the drum. At the same time, the drum is caused to rotate at a low speed. A signal starting spin-extraction for a pre-defined period of time enables a lower water level to be restored in the tub. The initially filled-in water is let into the tub in such an amount that the upper edge of the liquid in the tub eventually remains constantly below the lower edge of the drum, such an alternate sequence of recirculation and spin-extraction phases being repeated several times.

Abstract: Clothes washing machine provided with a washing tub made of plastic material and comprising a rear wall (2), a passing-through hub provided at the center of said rear wall and inserted in its central hub-holding portion (4) for supporting the bearing (7) used to support the central shaft (5) of the drum (6), wherein said hub includes a first perimetral sleeve (8) adapted to be inserted from inside the tub, the outer cylindrical edge thereof being adapted to engage against the inner edge of said cylindrical central hub-holding portion (4), a second sleeve (9) capable of being inserted from outside the tub into the inner cylindrical cavity of said first sleeve, the outer edge thereof being adapted to engage, preferably in a screw-like manner, against the inner edge of said first perimetral sleeve (8).

Abstract: A dishwasher has a spray agitator (1) rotating about an axis (2) and fed with water under pressure so as to emit several water jets. A rotating pressure jet (10) periodically reverses the direction of rotation of the agitator (1). The dishes are washed efficiently even if a mechanical obstruction interferes with the agitator (1).

Abstract: A dishwasher with a spray agitator (1) rotating about an axis (2) in alternating opposite directions due to the effect of two nozzles with opposite thrusts (6,7). The nozzles are alternately fed with water under pressure by means of a rotating shutter (13). The shutter is made to rotate by reduction gears (12,14) and a rotor (11) activated by a nozzle (8) provided inside the agitator (1). The dishes are washed efficiently even if a mechanical obstruction interferes with the agitator.

Abstract: A dishwashing machine includes a water circulation circuit provided with at least one rotating spray arm (6, 7) arranged in a washing tank (3). Water collecting in a sump (5) on the bottom (4) of the tank is supplied to the spray arm through a circulation pump (8). The water is heated up by an electric resistive heating element (11) housed in a casing (10) that is a part of the water circulation circuit (9). The casing (10) is arranged within the washing tank (3) in such a manner that the heating element (11) is in a heat-exchange relationship with the interior of the washing tank and the water collecting in the sump (5) through a surface of the casing.

Abstract: A dishwashing machine having a wash tank (1) arranged to be supplied with fresh supply water through an appropriate water supply circuit (8-14). The machine is adapted to perform operational cycles including a washing phase and at least one rinsing phase. A water recovery system (14, 15) is provided to store in a reservoir (11) water from the last rinse for re-using during a subsequent washing cycle. The reservoir (11) is a part of the water supply circuit (8-14) so that the reservoir is capable of being flushed by the fresh water delivered into the tank (1,4) when the supply circuit is opened.

Abstract: A clothes washing machine is provided with a tank (2) for the recovery of liquids and a transfer conduit (3) which, by way of a first pump (4) disposed in the conduit, connects the lower portion of the tub (1) to the tank. The lower volume of the tank is connected by way of a suitable conduit (6) and a second pump (7) to a nozzle (8) that discharges into the hydraulic circuit (9) that feeds containers (10) for substances for the washing operation. The machine has one or more of the following properties. The feed pump (7) for the hydraulic distributor (9) and the feed pump (12) for the condenser (11) are replaced by a single pump (17) and by a two-way directional control valve (18) which alternatively feeds respective conduits that feed into the hydraulic distributor and into the condenser. The discharge pump (20) and the transfer pump (4) are replaced by a single pump followed by a further directional control valve (21) which alternatively feeds the transfer conduit or the discharge.

Abstract: A top-loading washing machine including a washer assembly (1) and an appliance exterior having a front (2) and side plates (3, 4). The machine also includes an upper lid (5), an upper control panel (6), and support feet (29). The elements are assembled and supported by a bearing structure having two distinct lower and upper elements (8, 9). The lower element (8) includes a support base provided with respective columns at four corners that extend vertically from the bottom and terminate at the same height. The upper element (9) is provided with respective columns at four corners that extend vertically. The bottoms of said upper columns rest on the tops of the lower columns. The front (2) and side plates (3, 4) of said appliance are made from a single strip of sheet metal, folded so as to fit against said bearing structure in order to enclose completely the respective side and front faces. The plates are provided with extension fitting into grooves in the upper and lower elements.

Abstract: At least one comb-like divider (5) that is movable between an erect position and a lowered position is pivotably mounted on the basket. A pivot member (6) of the divider is pivoted in an elongate hole of at least one support member (8) which is fixed to the basket. At least one shaped projection (10) of the pivot member (6) is capable of slidably co-operating with a cam profile (14) of the member (8). The cam profile terminates upwardly with a recess (15) that is aligned with the elongate hole (9) and receives the shaped projection (10) when the movable divider (5) is in the erect position. The shaped projection (10) is disengageable from the recess (15) with a lifting movement of the pivot member (6) along the elongate hole (9) in such a way as to permit the movable divider (5) to rotate towards the lowered position.

Abstract: A dishwasher basket (5) slides along horizontal guides to which are attached sliding devices (8) and lateral post-and-slot connectors with two releases (17, 18). The basket (5) can be positioned selectively between an upper position and a lower position, defined by the post-and-slot connectors (17, 18), by applying to the basket a direct upward force so as to activate the connectors.